GMC 2007 Envoy - Manual (Page 187)

To change the current mode, select one of the
following:
H
(Vent): This mode directs air to the instrument
panel outlets.
) (Bi-Level): This mode directs about half of the
air to the instrument panel outlets; then directs
most of the remaining air to the floor outlets. A little
air is directed toward the windshield and the
side window outlets. Cooler air is directed to the
upper vents and warmer air to the floor outlets.
6 (Floor): This mode directs most of the
air to the floor outlets with a little air directed to
the windshield and the side window outlets.
The recirculation button cannot be selected while
in floor mode.
@ (Recirculation): Recirculation mode is used
to recirculate the air inside of your vehicle.
When this button is pressed, an indicator light in
the button will come on to let you know that it
is active. Use this mode to help prevent outside
odors and/or dust from entering your vehicle or to
help cool the air inside of your vehicle more
quickly. The air conditioning compressor will also
come on when this mode is activated. While in
recirculation mode, the windows may fog when the
weather is cold and damp. To clear the fog,
select either the defog or defrost mode and
increase fan speed.
Defog and defrost modes are described later in
this section.
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